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Geography
Pradeep Kumar

15/02/21 11:48 AM IST

What caused south Indian deluge in early January

Context

As many as 16 districts received 10 times (or more) the normal rainfall. The most excess was seen in Tiruppur district with almost 20 times the usual rainfall.

In news

All districts in Kerala had large excess rainfall with the highest being in Kasargod and Malappuram, where the rainfall was 100 times the normal

Reason for the rainfall
  • The polar sudden stratospheric warming or SSW is one of the reasons for the high rainfall in the tropics this year
  • SSW events are regular but non-periodical. No SSW events were reported between 2013 and 2018 (see ‘A decade of warming Arctic stratosphere’).
  • SSW occurs in two phases — easterly and westerly — based on the direction of the planet it impacts.
Source: US National Oceanic and Atmospheric Administration

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